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A Case-study of Compression Index Prediction on Very Soft Clay

초연약 점토지반 압축지수 추정에 관한 연구

Byeong-Kyu Kim1
,
Song Lee2*
김 병규1
,
이 송2*
1General Manager, Korea port Engineering corp.
2Chairman, DASOL Engineering Co. Ltd.
1한국항만기술단 부장
2다솔엔지니어링 회장
*교신저자. *Corresponding Author. 
30 April 2015. pp. 13-18
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Abstract

Considering dredged ground is consolidated more than one meter, Compression index prediction is very important. But, UD-sampling and consolidation test are impossible because of high moisture content and weak shear strength. This paper demonstrates the compression index relation, , between in-situ and dredged clay using N. Keith Tovey’s Omega point and soil physical properties. Good relationship is confirmed between proposed formula and measured primary consolidation result on dredged ground in The Republic of Korea.

Keywords
Dredging reclamation
Soft clay
Compression index prediction
Omega point
Moisture content

하중이 가해지면 수십 cm에서 수 m까지 침하가 발생하는 준설매립지반의 압축특성 파악은 매우 중요하다고 할 수 있으나, 고 합수비와 낮은 전단강도로 인해 불교란 시료채취가 불가능하고 압밀시험 또한 불가능한 실정이다. 이러한 문제를 해결하기 위해 본 논문에서는 N. Keith Tovey의 omega point와 점토의 물리적 특성변화에 대한 기본적인 가정을 이용하여 원지반과 준설매립점토 사이에는 관계를 가진다는 것을 수학적으로 증명하였으며, 제안식의 신뢰성을 검증하기 위해 준설매립을 통해 지반이 조성된 국내 1개 현장에서 수행된 계측결과에 대한 분석결과, 매우 양호한 상관관계를 보이는 것으로 나타났다.

References
1
1.Jeon, J.S. and Koo, J.K. (2011), “Assessment on Consolidation Material Function and Initial Stress for Soft Ground by Hydraulic Fill the at Southern Coast of Korea”, Korea Institute for  Structural maintenance and inspection, Vol.15(4), pp.136-144.
2
2.Lee, S., Jeon, J.S., and Yi, C.T. (2004), “Characteristics of Material Function Related to Permeability and Compressibility for Soft Clay Ground”, Korea Institute for Structural maintenance and inspection Vol.8(1), pp.183-194.
3
3.Lee, Kuantsai (1979), “An Analytical and Experimental Study of Large Strain Soil Consolidation”, Paper for the degree of doctor of philosophy on the University of Oxford.
4
4.Mikasa, M. (1965), “The Consolidation of Soft Clay, A New Consolidation Theory and Its Application”, Japanese Society of Civil Engineering(Reprint from Civil Engineers in Japa), pp.21-26.
5
5.Gibson, R.E., England, G.L., and Hussey, M.J.L. (1967), “The Theory of One-Dimensional Consolidation of Saturated Clay 1. Finite Non-Linear Consolidation of Thin Homogeneous layers”, Geotechnique, Vol.17, pp.261-273.
6
6.Carrier, W.D. and Beckman, J.F. (1984), “Correlation between test and the properties of remolded clays”, Geotechnique, 34(2): 211-228.
7
7.Timothy D. Stark, Hangseok Choi, and Paul R. Schroeder (2005), “Settlement of Dredged and Contaminated Material Placement Areas. II”, Journal of Waterway, Port, Coastal, and Ocean Engineering @Asce, pp.52-61.
Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 31
  • No :4
  • Pages :13-18
  • Received Date : 2014-07-15
  • Revised Date : 2014-11-13
  • Accepted Date : 2015-04-08
  • DOI :https://doi.org/10.7843/kgs.2015.31.4.13
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